In a box, the ratio of red marbles to blue marbles is 7:4. Which of the following could be the total number of marbles in the box?

(A) 18 (B) 19 (C) 21 (D) 22

Dear Student

Option (D) is correct here.
From the question it is given that, the ratio of red marbles to blue marbles is 7:4.
Now, let us assume the common factor of 7 and 4 be x.
So, the total number of marbles in the box = 7x + 4x
= 11x
Hence number of marbles in the box is a multiple of 11.
Therefore, 11 × 2 = 22


Thanks